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CSV to JSON Converter

Paste CSV with a header row and get a clean JSON array of objects — copy or download, all in your browser.

  • No upload
  • Browser-based
  • Free
  • No signup

Converted entirely in your browser — nothing you paste is uploaded or stored.

Formatting happens in your browser. Nothing is uploaded.

How to use CSV to JSON

  1. Paste your CSV, with headers on the first line.
  2. Leave the delimiter on auto-detect, or choose one.
  3. Toggle pretty-print if you want indented JSON.
  4. Copy the JSON or download the .json file.

Common use cases

  • Spreadsheet to API.
  • Data prep.
  • Quick inspection.

Tips

  • Make sure the header row has a name for every column.
  • Use quotes around any value that itself contains the delimiter.

Troubleshooting

Frequently asked questions

What CSV format does it expect?
The first row is treated as the column headers; each following row becomes an object keyed by those headers. Quoted fields, embedded commas and line breaks, and doubled quotes are all parsed correctly.
Does it detect the delimiter?
Yes — auto-detect picks comma, semicolon or tab based on the header row, or you can set it manually.
Are numbers converted?
Plain integer, decimal and true/false values are converted to real JSON numbers and booleans; everything else stays a string.
Is anything I enter uploaded?
No. Everything runs entirely in your browser — nothing you enter is uploaded, stored or shared, and no signup is needed.